Antique Brooch 1918-20s Edwardian Amethyst Rhinestone Czech Pin Art Deco

Large Antique Brooch 1918-20s Edwardian Amethyst Rhinestone Czech. In overall great antique condition. Some wear on back. Please see pictures for condition and approx. size measurement. I just love this brooch and took so many pictures with different lighting. :) Art Deco Period: 1900-1930. Dating by Safety Catch: This brooch as a "modern safety catch c. Post-1911. The "modern safety catch" used to fasten brooch pins was invented in 1911. The modern pin catch features a rotating mechanism that secures the pin, preventing accidental slippage. This style of safety catch is still widely used today.